2022 Fiscal Year Final Research Report
Study on the development of active knocking control using a pre-chamber torch flame
| Project/Area Number |
20K04330
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 19020:Thermal engineering-related
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| Research Institution | Oita University |
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Principal Investigator |
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 燃焼 / 副室式点火燃焼 / 内燃機関 |
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| Outline of Final Research Achievements |
The purpose of this study is to elucidate the phenomenon of knocking and to establish a technique to actively reduce the knocking intensity by means of a torch flame from the pre-chamber. In this study, knocking was investigated by visualization experiments using a rapid compression and expansion machine. In a previous study, the authors investigated the relationship between fuel auto-ignition characteristics and knock strength and reported that fuel properties and the temperature field during auto-ignition have an effect on knock strength in spark-ignition engines. In the case of a pre-chamber ignition system, the knocking characteristics may be different from those of a spark-ignition engine because the temperature field during auto-ignition is greatly changed by the torch flame. In this study, the knocking characteristics were investigated in detail by changing the shape of the pre-chamber.
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| Free Research Field |
熱工学
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| Academic Significance and Societal Importance of the Research Achievements |
SDGs「エネルギー」関連の目標達成のためには化石燃料のさらなる高効率・低公害な利用技術の確立が求められている．現在，運輸・発電分野におけるエネルギー利用の主力である火花点火エンジンの熱効率向上のために高過給・高圧縮比化がすすめられているが，高過給・高圧縮比化により異常燃焼（ノッキング）が発生しやすくなることから，ノッキングの現象解明および回避策の確立は熱効率向上に際して重要な課題となっている．本研究結果では副室からの噴流ガスの噴出特性とノッキングの発生現象には相関があることがわかった．このことから今後の能動的制御の基礎データとなるものと考える．
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